Marathon races near Tokyo

Tokyo Base Miles, River Roads

Tokyo hosts 71 Marathon races in 2026 within 80 km of the city centre — upcoming dates, recurring series, and other races nearby, all in one place.

Locals run the Imperial Palace loop when they want simple base miles right in the heart of the city. Tokyo Running Club runs around Kokyogaien on weekday evenings around 7 PM, and the pace stays comfortable enough for chat. Yoyogi Park, Ueno Park, and the Meguro River handle easy days when the city centre feels too tight. Shiba Park gives stair work next to Zozoji, and each stair is quite deep but the rise is low. Tokyo Marathon is the anchor event, and Tokyo Legacy Half Marathon keeps the calendar honest.

Locals ride flat first, then point west when the legs need climbing. The Imperial Palace loop course runs about 5km, Komazawa Olympic Park gives a 2km dedicated course, and the Yamanote Line loop course stretches about 35km for urban Z2. Tama River Cycling Road runs about 50km, and Arakawa Cycling Road runs about 80-90km for steady base miles. Half Fast starts many rides by the Grand Hyatt in Roppongi Hills, while TCC, Tokyo Cycling Club, and Positivo Espresso cover social rides, strong groups, and hills around Tokyo. Mount Takao, Takao & Yabitsu, and the Tama area hold the proper climbs.

Spring and autumn are the clean choice for both sports, with March-May and September-November giving pleasant temperatures and lower rainfall. Summer averages 27°C, so locals move intervals early, keep Z2 honest, and treat riverside shade like a training tool. Annual rainfall averages nearly 1530mm, and wetter summers make the Arakawa River, Tama River, and park loops useful because they are easy to bail from. Winter drops to 1°C, and sporadic snow pushes cyclists toward flatter city loops while runners keep the Palace and parks ticking.